php sum of array - php

Question

I have the following array with multiple levels. I wish to get the sum total of [price], [adults] and [childern] but have not been able traverse the levels.
The answer I should get with this example is price=380 adults=5 and children=1
Array (
[8] => Array (
[2] => Array (
[num_rooms] => 2
[adults] => Array (
[0] => 1
[1] => 1
)
[children] => Array (
[0] => 0
[1] => 0
)
[prices] => Array (
[0] => 50
[1] => 50
)
[price] => 130
[supp] => 30
)
[3] => Array (
[num_rooms] => 1
[adults] => Array (
[0] => 1
)
[prices] => Array (
[0] => 100
)
[price] => 150
[supp] => 50
)
)
[1] => Array (
[2] => Array (
[num_rooms] => 2
[adults] => Array (
[0] => 1
[1] => 1
)
[children] => Array (
[0] => 1
[1] => 0
)
[prices] => Array (
[0] => 75
[1] => 75
)
[price] => 170
[supp] => 20
)
)
)
Thanks

Answer 1

Two loops and a helper array:
$sums = array ( 'price' => 0, 'adults' => 0, 'children' => 0 );
foreach($array as $outer) {
foreach($outer as $inner) {
$sums['price'] += $inner['price'];
$sums['adults'] += array_sum($inner['adults']);
$sums['children'] += array_sum($inner['children']);
}
}
print_r($sums);
With a more dynamic version of the inner loop:
foreach($array as $outer) {
foreach($outer as $inner) {
foreach($sums as $key => &$v)
$v += is_array($inner[$key])
? array_sum($inner[$key])
: $inner[$key];
}
}

Answer 2

This should work:
$price = 0;
$adults = 0;
$children = 0;
foreach($arr as $l1_key => $l1_value) // iterates over the first level array
{
foreach($l1_value as $l2_key => $l2_value) // iterates over second level arrays
{
$price += $l2_value['price']; // add up price totals
foreach($l2_value['adults'] as $value) // iterate through adults array values
{
$adults += $value; // sum up adult count
}
foreach($l2_value['children'] as $value) // iterate through children array values
{
$children += $value; // sum up children count
}
}
}
// now $price, $adults, and $children contain the totals for each

Answer 3

I didn't test this code but at the same time I don't know how you got 380.. I'm seeing 350?
$sums = getSum($arr);
print_r($sums);
function getSum($arr) {
$sums = array();
$sums2 = array();
$sums['adults'] = 0;
$sums2['adults'] = 0;
$sums['children'] = 0;
$sums2['children'] = 0;
$sums['prices'] = 0;
$sums2['prices'] = 0;
foreach ($arr as $key => $value) {
$do_not_recurse = false;
switch ($key) {
case 'adults':
$do_not_recurse = true;
foreach ($value as $adults)
$sums['adults'] += $adults;
break;
case 'children':
$do_not_recurse = true;
foreach ($value as $children)
$sums['children'] += $children;
break;
case 'prices':
$do_not_recurse = true;
foreach ($value as $price)
$sums['prices'] += $price;
break;
default:
break;
}
if (is_array($value))
$sums2 = getSum($value);
}
$sums['adults'] += $sums2['adults'];
$sums['children'] += $sums2['children'];
$sums['prices'] += $sums2['prices'];
return $sums;
}

Answer 4

Handles any depth or array structure and just picks out the terms with the names you are looking for:
function find($term, $array) {
$count = 0;
foreach ($array as $item)
if (is_array($item)) $count += find($term, $item);
if (isset($array[$term]) {
if (is_array($array[$term])) $count += array_sum($array[$term]);
else $count += $array[$term];
}
return $count;
}
echo count('price', <the array>);
echo count('adults', <the array>);
echo count('children', <the array>);